Sound box and tone arm



Oct. 27, 1925. 1,559,514

J. ZITZER MAN SOUND BOXVAND TONE ARM Filed June 30, 1923 l/WENTOR WITNESSES cf' cas Z zz'zzflemu 7 BY JMIQ ATTORNEYS Patented Oct. 27, 1925.

1 UNITED STATES P A E NTC OFFICE.

moon ZITZERMAN, or BROOKLYN, NEW YORK 'sounn Box Ann TONE ABM.

Application filed June 30, 1923. Serial No. 648,704.

To all whom it may concern.

Be it known that I, JACOB ZITZERMAN, a

' citizen of Russia, and a resident of thecity and tone arm thereof.

Some of the outstanding objects of the present invention are to provide a sound box which completelyhouses and protects the diaphragm; which simplifies the needle bar mounting; and which aims to increase th quality of the tone of the machine.

The invention furthermore contemplates an improvement in the tone arm mounting whereby the tone arm is maintained in a steady position and =more effectively sup portsthe outer free end with which the sound box is associated. Asa still further object the invention contemplates a sound box and tone arm which is comparatively simple in-its construction, inexpensive-to manufacture, and which is thoroughly reliable and highly efiicient in itspurpo'sel WVith the above recited and other objects in view, the invention resides in the novel construction set forth in the following specification, articularly pointed out in the appended ciaims' and illustratedin the accompanying. drawings, it being understood that the right is reserved to'embodiinents other than those actually illustrated herein to the full extent indicated by the general meaning of the terms in which the claims are expressed.

In the drawings Figure 1 is a fragmentary sectional view through a machine equipped with a tone arm and sound box constructed in accordance with the invention.

Fig. 2 is a sectional view through the sound box taken approximately on the line indicated at 22 in Fig. 1.

Fig. 3 is a fragmentary rear view of the tone arm with parts broken away and shown in section to dlsclose the underlying structure.

Referring to the drawings by characters of reference 10 designates the bed of the machine cabinet over which the turntable 11 is mounted for rotation andv which bed or base is apertured as at 12 to recelve therethrough the depending tubular boss 13 of the tone arm mounting base 14. The base .14 is provided with an upstanding collar 15 having a substantially horseshoe shaped bracket 16 into which the downturned rear end 17 of the tone arm 18 projects, the said lower extremity -19 of the downturned end 17being received in the upper enlarged bore of the cover 15. I Immediately belowjthe extremity 19 of the'tone arm a step bearing 20 is arranged in the reduced'bore of the collar 15 and receives a pintle era the lower end of the vertical shaft section 22 which extends axially through the downturned end 17 of the tone arm and protrudes therethrough,

said shaft having a bearing socket 23 in its upper end which receives the downwardly, projecting bearing pin 24 threaded through the bight of the horseshoe shaped bracket 16. Under this arrangement the tone' arm is more steadily mounted for horizontal swinging movements. The outer end of the tone arm has swiveled therein an arcuately turnable end; section 25 with which the sound box designated generally by the character 26 is associated.[ The sound box consists of a pair of'm'atin'g semi-spherical sections 27 and 28, the former being provided with a bossed outlet 29 over which the end section 25 of the tone arm is frictionally and telescopically engaged. Within the section. 27 an annular enlargement providing aseat 30 is formed and from its outer open side'an annular flange 31 extends. section 28 is provided with a pair of spaced concentric inner and outer annular flanges 32 and 33 which define therebetween an annular groove 34 for receiving therein the "flange 31 of the section 27 when the sections '33 are apertured in alignment with the collar to allow for the passage therethro-ugh of the stylus bar 39, the enlarged outer end 40 of which is provided with an end socket 41 The opposite I in which thestylus {i2 is receiyed and retained by a screw43. The stylus bar ispiv oted to the collar by means of cone bearings 44 and is further provided with a hollow or space 45 within thesame which tends to render the sound reproduction mellower and to eliminate scratching vibrations of the diaphragm. The outer section 28 is provided with a plurality of openings 46 and with a central oiitwardly projecting manipulating handle 47' for lifting and turning the sound bozi and'tone'arm section 25. 5

Under "this arrangement it will be noted that the diaphragnnis thoroughly covered and protected against breakage while the same may be readily uncoveredand removed for the purpose of repairs simply remoV ing the screws3Z and the outer section '28.

I claim:

1. A sound box for sound reproducing machines comprising a pair of mating semispherical sections one of said sections having at its open edge internal and external a n'nular rabhets, the internal rabbet being of greater" depth'than the external rabbet and defining an annular seat at its inner end, the other sectionhavi'ng concentric inner and outer spaced flanges at its open'eolge, the inner flange beingfot' greater width than the outer flange and designed to be received within the'internalrabbet of the'other' sec tion to coacta-t its outer "end with the seat to clamp a diaphragm thereagainst, the outer flange fitting within the outer rabbet and defining together with the inner flange a groove liorthe reception of'the projecting portion of the other section, and fastening elements extending radially through the outer and'inner flanges of one of the sections and the projecting portion of thelother section. i

29A sound box for sound reproducing machines -comprising a pair of mating semi spherical sections'one" of. said sections hav ing at its open edge internal and external annular rabbets, the internal rabbet" being of greatendepth than' the external'rabbet and defining an annularsat atits inner end,

the other section having concentric inner and outer spaced flanges at'its'open edge, the inner flange being of greater width than the outer flange and designed to be received within theinternalrabbet of the other section to coact at its outer end with the seat to clamp a diaphragm thereagainst, the outer flange fitting within the outer rabbet and defining together with the inner flange a groove for the reception of the projecting portion of the other section, and fastening elements extending radially through the outer and inner flange of one of the sections and'the projecting portion of the other sec tion, the said first mentioned section having an axially projecting radially apertured col lar and the flanges Off the said second section and open edge at the first section' having alined notches for receiving therethrough the stylus bar of the diaphragm.

3. A sound box for sound reproducing machines comprising a pair of mating semispherical sections, one of said sections having an internal annular rib defining a seat the outer corner of the free edge being rabbeted to' provide anannular outwardlyprojecting flange, spaced concentric inner and outer flanges formed at the outer edge of'the othersection defining therebetween an. annular groove within which the annular flange of thefirst section is received, the inner flange oft-he secondsection extending within the open end of thefirst section and adapted to co'act with the internal seatffor clamping therebetween a diaph agm, the outer flange of, the secend section extend ng within ther jbbeted outer corne of the first section, a collar projectingtrom the edge of the first section, the said flange of the first section and flanges of the second section having alined openings disposed in registry with the collar for receiving, therethrough the stylus bar of the diaphragm a d means extending through 'the"overlap ping flanges ofsaid sections --lfor removably connecting the sections together.

JACOB z rzEnMan 

